On Sunday, 24 February 2013 18:55:31 UTC+1, John Williamson wrote:
> If you mean the Rosemary classic clay roof tiles made by Redland, they
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> don't use a coating to make them waterproof, as well fired clay is
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> naturally waterproof, which means they can be re-used indefinitely as
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> long as they are sound and will be weatherproof as long as they are
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> correctly laid.
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> They've been in continuous production now for a *long* time.
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>
http://www.monier.co.uk/products/product-catalogue/product-range/product/rosemary-clay-classic.html
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>
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> If not, then what type of tiles do you mean?
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> --
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> Tciao for Now!
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>
>
> John.
The orange coloured ones from the picture on the link you kindly posted, by the look of it. They don't appear to have any nail holes for some reason. :-/
Some builder told me you can tell if the tiles have gone west by examining the underside of them after a strong spell of rain. If they show a damp-looking patch then they're knackered and should be replaced.
Fortunately it won't cost me anything to get rid of them as he told me he'd take them away himself to use as hardcore on another job, so that's one less cost I have to worry about anyway.